This
1949 device was a VHF Band I RF pre-amplifier, using valves. The
rotary control top right would have been to adjust the gain. It
seems that the device could be used to drive a distribution system,
presumably by feeding into a multi-way resistive splitter (a star
network). The metal case and two-pin mains plug seem to offer
scope for disaster, but of course electrical safety standards
were much lower in those days. Ten guineas was about two week's
wages for a skilled tradesman. How would you like to pay two week's
wages for a set-back amplifier?